Belt-pulley



v Fig. 3 shows a section of a part of the pulley' UNITED l STATES y PATENT OFFICE.

AUBIN "WOOD, OF WORCESTER, MASSACHUSETTS.

BELT-PULLEY.

SPECIFICATION forming part of Letters Patent No. 280,775, ated July 3, 1883.

Application tiled June 6, 1881. Renewed June 12, 1883. (No model.)

l'o all whom it may concern:v

Be it known that I, AURIN WOOD, a citizen of the-United States, residing in Worcester, inthe county of Worcester and State of Massachusetts, have invented a new and useful Improvent in Belt-Pulleys, of which the following is a specification. y

My invention relates to the construction of cast-metal pulleys in which the nave and arms are cast in one or more pieces, but` separate from the rim; also, to an improved method of balancing a belt-pulley; and the objects of my' invention are, first, to attach in a simple and efficient manner the rim and spider when the same have been cast in` separate pieces; second, to secure the advantages of a solid pulley, and at the same time alloysr 'the pulley to be changed to a clamp-pulley; and, third, to provide an improved method of balancing the pulley. These several obj ects I accomplish by the means and in the manner illustrated in the accompanying drawings, in which Figurel shows an elevation of a belt-,pulley embodying my invention. Fig. '2 shows a horizontal section of the same on the line .fc x.

on the line s s, and on an enlarged scale; and Fig. 4t represents a detailed view of the end of one arm and a portion of the attached rim, as shown in Fig. l at a a.

Similar letters refer to similar parts in the several figures.

A represents the hub, and A A the arms, which I cast either in one piece or in halves, with flanges on opposite sides of the hubsD D, Fig. l, in which case I bolt the halves firmly together by means of bolts passed through the flanges D D. At or near the ends of the arms A A, I form small chambers or recesses C by inserting suitably-shaped cores in the mold.

The rim B B, I cast in one piece, but separate from the spider. rlhe inner surface of the rim may be vmade straight, or it may have a zone or band, E E, slightly raised from the inner surface of the rim, for the purposes hereinafter set forth. Whenever lthe rim is intended to be used with or upon a ,spider which has been cast in halves, as vshown in Figs. l, I place upon its inner surface, at opposite sides, small transverse channels, as at a. c, Figs. 1 and 4, extending entirely across' the rim, and formed by either having similar l channels in the pattern or by inserting cores of the proper shape and size in the mold, allowing sufficient space between the cores and the outside of the mold to permit the molten meltal to iiow freely. By casting the spider and rim in separate pieces I avoid the strain resulting from the unequal contraction of the metal in different portions of the pulley in cooling, which is liable to fracture the arms and also to destroy the circular shape of the rim.

My improved method of attaching the rim to the spider is as follows: I turn or grind the inner surface of the rim to a circle, and by casting the zone or band E E, I stiffen the rim and avoid the necessity of grinding or turning the entire inner surface of the rim. I also turn or grind the outer ends of the arms to a circle corresponding to the nished inner surface ofthe rim. The rim is then placed up on the 4arms A A, as shown in Fig. l, being made to fit tightly upon the ends of the arms. When the rim is put upon a spider cast in halves, as in Fig. 1, care should be taken to place the transverse channels a a opposite the dividingline a c. From the outside of the rim to the chambers C, and through the intervening metal, I place pins or screws a a, putting one screw through the rim and into each of the whole arms and two screws into each of the halved arms, one on each side of the channel a. and dividing-line a, thus securely fastening the rim upon the arms. rIhe outer surface or face of the rim is then ground or turned to a circular form, which is rendered a much simpler and easier operation than in the usual mode of making cast-metal pulleys, as the rim by my method of construction will nearly approximate the desired form.

When the pulley is constructed with a spider cast in halves, as in Fig. l, the advantages of a solid pulley are secured, as the rim is in one continuous piece, and the rim may be cut or sawed apart at the opposite sides a c, thus readily forming a clamp 2 pulley held together by the bolts through the flanges D D. rIhe chambers C, I use for a twofold purpose: first, to provide an open space into which to pass the drill and tap in making the holes for the pins or screws a, although the pulley might be constructed with solid arms; and, second, to form a recess or chamber at or near the outer IOO ends of the arms A A, for the reception of molten lead or other metal for the purpose of balancing the pulley. The outer and inner sides of the chambers C, Iform of opposing` convcxity, as at l and 2, Fig. l, sothat the cross-section at the center of the chamber shall be larger than at either opening, in order to prevent the inserted metal from coming out. The inserted metal may, however, be retained by any of the well-known methods in use for the purpose.

My invention is not confined to the use of a cast-1netal "rim having a raised zone or band, E E, as the; inner surface of the rim may be plain and iinished over its whole extent. The use of the chambers C are specially desirable in the constructionherein described; but they are also usel'ul in the ordinary form of castmetal pulleys, as it avoids the usual unseemly and insecure method of loading' the pulley in order to balance it, presenting rough surfaces l'or the accumulation of dust and lint and increasing` the atmospheric resistance when the pulley is in rapid motion.

I am aware that Wheels have been cast in pieces, the rim forming` one and the hubs and arms another, therefore l do not claim such a construction; but

\VhatIdo claim as my invention, and desire to secure by Letters Patent, is-

1. That improvement in the mode o1 construeting cast-metal pulleys consistingin castiing the rim in one continuous piece and the spider in one or .more pieces and finishing the inner surface of the rim and the outer ends of 3 5 the arms to corresponding circles, and afterward attaching the rim to the arms by means of pins or screws a, as described, and for the purposes set forth.

2. A belt-pulley having chambers C in the arms A, as and for the purposes set forth.

3. A belt-pulley composed of a castanetal rim and a rimless spider having chambers in the arms A', as described, and for the purposes set forth.

4. A belt-pulley composed of a cast-metal rim, B, and a rimless spider having:r chambers U in the arms A, and attaching` pins or screws a, as described and for the purposes set forth.

A east-metal rim, B, for belt-pulleys,

having a raised zone or band, E E, on its inner surface, as and for the purposes set forth.

6. A castmetal rim iorbelt-pnlleys, having transverse channels a c on opposite sides, as described, and for the purposes set forth.

7. A belt-pulley composed of a cast-metal rim, B, with transverse channels a c" and a rimless spider made in halves and havingI1 flanges D D, as and for the purposes set forth.

AURTN VOOD.

YV tn csses:

B. NV. POTTER, .Turns GREEN. 

